#include <stdio.h>
int main()
{
int i;
scanf("%d",&i);
printf("Your score:");
switch(i)
{
case 90 ... 100:printf("A\n");break;
	 	
case 80 ... 89:printf("B\n");break;
	 	
case 70 ... 79:printf("C\n");break;
	 	
case 60 ... 69:printf("D\n");break;
	 	
case  0 ... 59:printf("E\n");break;

default:printf("enter right");
}
return 0;
}
